The Concept of Simulation of Two Electrical Vehicles with Energy Storage Systems Connected to Common Contact Network

In this paper the principle of two traction drive test benches with energy storage system collaboration for simulation of two passenger electric vehicles belonging to one contact network section is described

Application of Supercapacitor Energy Storage Devices

The article discusses an actual theme about improving of energetic efficiency of industrial induction drives. New AC motor control schemes with supercapacitor energy storage devices for motor stator parametric control in continuous and pulse modes are developed. The starting device allows decreasing of motor torque jerks at the beginning of the transient process thus providing elimination of the consumed energy and drive system mechanical wear. There is given the storage system efficiency factor calculation in the capacitor charging mode with constant current. The new device has a higher efficiency factor

Digitally Controlled Synchronous Buck-Boost Converter for Ultracapacitor Based Energy Storage Application

This paper presents a synchronous buck-boost DC-DC converter which connects the ultracapacitor pack and a DC bus of an electric vehicle. In order to control this kind of DC-DC converter the digital signal processor (DSP) is used. The proposed power converter charges ultracapacitor pack to store the kinetic energy during vehicle braking and regenerate this stored energy during next speed up. In the paper the software algorithm of the control loop of the converter is presented. The experimental test of the DC-DC converter was performed using the test platform for DC electric motor of traction vehicle. The presented switched converter can be used for electric vehicle with low-power DC electric motor

A Digitally Controlled Test Bench for DC Electrical Drives

This paper presents a test platform for low-power DC electric motor of traction vehicle or high-power motor scaled analog in the traction and braking modes. The load simulator of the traction drive is made by applying the induction motor controlled by a frequency converter. A microcontroller controls bi-directional DC/DC converter and sends speed reference signal to the frequency converter. The test bench is useful to determine power consumption of motor in various speed cycles, as demonstration bench to show operation of electric vehicle to students and to investigate the strategies of energy sources charge and discharge

The Application of Supercapacitor Energy Storage Devices In DC Drives

The article looks on actual theme about improoving of energetic efficiency of exploitated DC traction drives. There are developed the separate schemes for DC motor starting and braking regimes by using the supercapacitor energy saving devices for motor armature shunting. The starting device allows to decrease the motor torque jerks at the beginning of transient process thus providing the elimination of consumed energy and drive system mechanical wear. There is given the saved energy calculating equivalent circuit and expression. By varying the subtitution scheme shunting and ballast resistance values, the mechanical time constant changes with increasing the speed of transient processes. The estimated DC motor control device with supercapacitor battery allows to eliminate the need for ballast resistor. The decreasing of consumed energy is achieved in such way because the electrodynamic braking has realized simultaneosly with shunting of DC motor armature with the help of capacitor energy saver which decreases the armature voltage to provide the stable boost converter operation. The braking scheme with two converters transfers the energy saved in the filter capacitor to the supercapacitor energy saver independently from the filter capacitor voltage oscillation value. The new device has higher efficiency factor

Simulation of Regenerative Energy Storage with Supercapacitors in Tatra T3A Type Trams

The article deals with PSIM simulation results of the regenerative energy storage process with supercapacitors installed on the renewed Tatra T3A tramcars. Bidirectional supercapacitor’s current controller is connected to the filter capacitor of the tram DC converter and in the tram braking mode operates as a buck converter. The control scheme of the buck converter is suggested with two PID control loops: with filter capacitor voltage and supercapacitor current feedback. The results of PSIM simulation of tramcar braking process are given with and without overhead current fluctuations. Simulation results show the control system’s stability in both synchronous and asynchronous operation modes of the tram DC converter and supercapacitor’s current controller

Estimation of Traction Drive Test Bench with Energy Storage System Operation in Regenerative Braking Mode

The paper presents configuration of the traction drive test bench with energy storage system, calculation of the scale factors, estimation of the energy storage system size and Matlab simulation results of the bench operation in a braking mode at different levels of the supercapacitor initial voltage